UA 225 then UA 301 at San Francisco
Philadelphia → San Francisco → Denver
Timetable, San Francisco time
21:43UA 225 from Philadelphia at the gatealso VA 8238, NZ 9366
21:24UA 301 to Denver leaves the gatealso AC 3598, VA 8346, NZ 9055
23 h 41 apart on the timetable, overnight
UA 301 leaves 23 h 41 after UA 225 arrives on the timetable: more than half a day, so not a connection we count.